Insufficient evidence / under studyC/DgradePlausibility · Plausible thermal stimulus; efficacy for the marketed benefits is thin and the safety profile is the constraintThermal / Thermoregulatory
The safety profile governs, not the efficacy profile: the FDA warns of frostbite, burns, eye injury and asphyxiation risk (nitrogen-cooled units); no device is FDA-cleared for the marketed benefits.
Completes the thermal ladder alongside sauna and banya. For this row the safety profile governs, not the efficacy profile.
Origin & lineage
Cryo chambers (nitrogen / refrigerated).
Claimed mechanism
Brief whole-body cold exposure provoking a thermoregulatory / anti-inflammatory response.
Plausibility
Plausible thermal stimulus; efficacy for the marketed benefits is thin and the safety profile is the constraint.
Evidence — grade C/D
Completes the thermal ladder; the safety profile governs, not the efficacy profile (FDA consumer warning; 2023 review).
Market
Makers: Various cryo-chamber makers. Models: Nitrogen / electric cryo chambers. Price: Clinic.
Kernel — keep vs set aside
Keep — real substrate
A real, dosable thermal (cold) stimulus.
Set aside — claim
Efficacy for the marketed benefits is unproven, and the safety profile is the governing constraint.
Regulatory status by jurisdiction
Registration or clearance is a market-access fact, never proof of efficacy.
US — FDA
No device FDA-cleared for the marketed benefits; FDA consumer risk warning.